Process-Based Simulation of Aerosol-Cloud Interactions in a One-Dimensional Cirrus Model

被引:4
|
作者
Kaercher, B. [1 ]
机构
[1] DLR Oberpfaffenhofen, Inst Phys Atmosphare, Wessling, Germany
关键词
cirrus; cloud model; microphysics; ICE NUCLEATION; CONTRAIL; GROWTH; PARAMETERIZATION; TRANSITION; CRYSTALS; NUMBER; WATER; COEFFICIENT; TEMPERATURE;
D O I
10.1029/2019JD031847
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
A new microphysical cirrus model to simulate ice crystal nucleation, depositional growth, and gravitational settling is described. The model tracks individual simulation ice particles in a vertical column of air and allows moisture and heat profiles to be affected by turbulent diffusion. Ice crystal size- and supersaturation-dependent deposition coefficients are employed in a one-dimensional model framework. This enables the detailed simulation of microphysical feedbacks influencing the outcome of ice nucleation processes in cirrus. The use of spheroidal water vapor fluxes enables the prediction of primary ice crystal shapes once microscopic models describing the vapor uptake on the surfaces of cirrus ice crystals are better constrained. Two applications addressing contrail evolution and cirrus formation demonstrate the potential of the model for advanced studies of aerosol-cirrus interactions. It is shown that supersaturation in, and microphysical and optical properties of, cirrus are affected by variable deposition coefficients. Vertical variability in ice supersaturation, ice crystal sedimentation, and high turbulent diffusivity all tend to decrease homogeneously nucleated ice number mixing ratios over time, but low ice growth efficiencies counteract this tendency. Vertical mixing induces a tendency to delay the onset of homogeneous freezing. In situations of sustained large-scale cooling, natural cirrus clouds may often form in air surrounding persistent contrails.
引用
收藏
页数:21
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